Discussion Forum



1)

The average of 2, 7, 6 and x is 5 and the average of 18, 1, 6, x and y is 10. What is the value of y ?


A) 5

B) 10

C) 20

D) 30

Answer:

Option C

Explanation:

we have : $\frac{2+7+6+x}{4}=5$
15+x= 20
x=5

Also $\frac{18+1+6+x+y}{5}=10$
25+5+y=50
y=20